linux-kernel - Re: more dput lock contentions in 2.6.38-rc?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <AANLkTinsv8zDU50bWhN+gvJn5fUZ9rx=sOkp0gdpexkB@mail.gmail.com>
Date:	Tue, 25 Jan 2011 14:04:33 +1100
From:	Nick Piggin <npiggin@...il.com>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <npiggin@...nel.dk>,
	"Chen, Tim C" <tim.c.chen@...el.com>
Subject: Re: more dput lock contentions in 2.6.38-rc?

On Tue, Jan 25, 2011 at 1:46 PM, Shaohua Li <shaohua.li@...el.com> wrote:
> On Tue, Jan 25, 2011 at 10:09:48AM +0800, Nick Piggin wrote:

>> What does an actual snippet from perf with callgraphs look like?
> here is another perf report

OK well there a lot of hits reading /proc/mounts and statfs, but still
more that appear to be coming from fstat/open/unlink/rename.

It looks like they are coming from dropping rcu walk along the path
rather than a full restart. So we will have to see where those are
coming from. My stats patch will help with that.

Thanks,
Nick
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/